<template>
  <div>
      <!-- 面包屑导航区 -->
     <el-breadcrumb separator-class="el-icon-arrow-right">
         <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
         <el-breadcrumb-item>商品管理</el-breadcrumb-item>
         <el-breadcrumb-item>参数列表</el-breadcrumb-item>
     </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
        <!-- 警告区域 -->
    <el-alert
        title="注意:只允许为第三级分类设置相关参数"
        type="warning"
        :closable='false'
        show-icon
        >
    </el-alert>

<!-- 选择商品分类区 -->
<el-row class='cat_opt'>
    <el-col>
        <span>选择商品分类:</span>
     <el-cascader
         v-model="selectedCateKeys"
         :options="catelist"
         :props=" cateProps "
         @change="handleChange">
         </el-cascader>
    </el-col>
</el-row>

<!-- tab页签区 -->
<el-tabs v-model="activeName" @tab-click="handleTabClick">
    <!-- 添加动态参数的面板 -->
    <el-tab-pane label="动态参数" name="many">
        <!-- 添加参数的按钮 -->
        <el-button type='primary' size='mini' :disabled='isBtnDisabled' @click='addDialogVisible=true'>添加参数</el-button>
        <!-- 动态参数表格 -->
        <el-table :data='manyTableData' border stripe>
            <!-- 展开行 -->
            <el-table-column type='expand'>
                <template v-slot='scope'>
                     <!-- 循环渲染Tag标签 -->
                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{item}}</el-tag>
               <!-- 输入文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
               >
</el-input>
<!-- 保存的按钮 -->
<el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type='index' label='#'></el-table-column>
            <el-table-column label='参数名称' prop='attr_name'></el-table-column>
            <el-table-column label='操作'>
                <template v-slot='scope'>
                    <el-button type='primary' icon='el-icon-edit' size='mini' @click='showEditDialog(scope.row.attr_id)'>编辑</el-button></button>
                    <el-button type='danger' icon='el-icon-delete'size='mini' @click='removeParams(scope.row.attr_id)'>删除</el-button>
                </template>
            </el-table-column>
        </el-table>
    </el-tab-pane>
    <!-- 添加静态属性的面板 -->
    <el-tab-pane label="静态属性" name="only">
        <!-- 添加属性的按钮 -->
        <el-button type='primary' size='mini' :disabled='isBtnDisabled' @click='addDialogVisible=true'>添加属性</el-button>
    <!-- 动态参数表格 -->
        <el-table :data='onlyTableData' border stripe>
            <!-- 展开行 -->
            <el-table-column type='expand'>
                <template v-slot='scope'>
                     <!-- 循环渲染Tag标签 -->
                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{item}}</el-tag>
               <!-- 输入文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
               >
</el-input>
<!-- 保存的按钮 -->
<el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type='index' label='#'></el-table-column>
            <el-table-column label='参数名称' prop='attr_name'></el-table-column>
            <el-table-column label='操作'>
                <template v-slot='scope'>
                    <el-button type='primary' icon='el-icon-edit' size='mini' @click='showEditDialog(scope.row.attr_id)'>编辑</el-button></button>
                    <el-button type='danger' icon='el-icon-delete'size='mini' @click='removeParams(scope.row.attr_id)'>删除</el-button>
                </template>
            </el-table-column>
        </el-table>
    </el-tab-pane>
  </el-tabs>
    </el-card>


<!-- 添加参数的对话框 -->
    <el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
      <!-- 添加参数的对话框 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

<!-- 修改参数的对话框 -->
    <el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
      <!-- 添加参数的对话框 -->
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
 name:'Params',
 data(){
     return{
         //商品分类列表
         catelist:[],
         //级联选择框的配置对象
         cateProps:{
             expandTrigger: 'hover',
             value:'cat_id',
             label:'cat_name',
             children:'children'
         },
         //级联选择框双向绑定节点
         selectedCateKeys:[],
          //默认被激活的页签名称
         activeName:'many',
        //  动态参数的数据
         manyTableData:[],
        //  静态属性的数据
         onlyTableData:[],
         //控制添加对话框的显示与隐藏
         addDialogVisible:false,
         //添加数据的表单数据对象
         addForm:{
             attr_name:''
         },
         //添加表单的验证规则对象
         addFormRules:{
             attr_name:[{ required: true, message: '请输入参数名称', trigger: 'blur' }]
         },
            // 控制修改对话框的显示与隐藏
         editDialogVisible:false,
         //修改的表单数据对象
         editForm:{},
         // 修改表单的验证规则
         editFormRules:{
             attr_name:[{ required: true, message: '请输入参数名称', trigger: 'blur' }]
         },
     }
 },
 created() {
     //获取所有的商品分类列表
     this.getCateList()
 },
 methods:{
   async getCateList(){
      const {data:res} =await this.$http.get('categories')
      if(res.meta.status!==200){
          return this.$message.error('获取商品分类失败')
      }else{
        this.catelist=res.data
      }
   },
   //级联选择框选中项变化，会触发这个函数
handleChange(){
    //证明选中的不是三级分类
    this.getParamsData()
 },
 //tab页签点击事件的函数
handleTabClick(){

  this.getParamsData()
 },
 //获取参数的列表数据
 async getParamsData(){
    //  证明选中的不是三级分类
     if(this.selectedCateKeys.length!==3){
        this.selectedCateKeys=[]
        this.manyTableData=[]
        this.onlyTableData=[]
        return
    }else{
        // 选中的是三级分类
        console.log(this.selectedCateKeys);
        //根据所选分类的Id和当前所处的面板获取对应的参数
        const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes`,{params:{
            sel:this.activeName
        }})

        if(res.meta.status!==200){
            return this.$message.error('获取参数列表失败!')
        }else{
          res.data.forEach(item=>{
              item.attr_vals=item.attr_vals?item.attr_vals.split(' '):[]
              //控制文本框的显示与隐藏
              item.inputVisible=false
            //   文本框中输入的值
              item.inputValue=''
          })
          console.log(res.data);
          if(this.activeName==='many'){
              this.manyTableData=res.data
          }else{
              this.onlyTableData=res.data
          }
        }
    }
 },
 // 监听添加对话框的关闭事件
addDialogClosed() {
      this.$refs.addFormRef.resetFields()
  },
//   单机按钮做表单的预验证
  addParams(){
   this.$refs.addFormRef.validate(async valid=>{
       if(!valid)return
       const{data:res}=await this.$http.post(`categories/${this.cateId}/attributes`,{
           attr_name:this.addForm.attr_name,
           attr_sel:this.activeName
       })
       if(res.meta.status!==201){
           return this.$message.error('添加参数失败')
       }else{
           return this.$message.success('添加参数成功')
           this.addDialogVisible=false
           this.getCateList()
       }
   })
  },
//点击按钮展示修改对话框
  async showEditDialog(attr_id){
    //   查询当前参数的信息
      const{data:res}=await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{
          params:{attr_sel:this.activeName}
      })
      if(res.meta.status!==200){
          return this.$message.error('获取参数信息失败')
      }else{
          this.editForm=res.data
          this.editDialogVisible=true
      }
      
  },
  //重置修改表单
  editDialogClosed(){
   this.$refs.editFormRef.resetFields()
  },
  //点击按钮，修改参数信息
  editParams(){
   this.$refs.editFormRef.validate(async valid=>{
       if(!valid) return
       const{data:res}=await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
       {
           attr_name:this.editForm.attr_name,
           attr_sel:this.activeName
       }
       )
      if(res.meta.status!==200){
          return this.$message.error('修改参数失败')
      }else{
          this.$message.success('修改参数成功')
          this.getCateList()
          this.editDialogVisible=false
      }
    })
  },
  //根据id删除对应的参数项
 async removeParams(attr_id){
   const confirmResult=await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
     confirmButtonText: '确定',
     cancelButtonText: '取消',
     type: 'warning'
   }).catch(err=>err)
   if(confirmResult!=='confirm'){
       return this.$message.info('已取消删除')
   }else{
       const{data:res}=await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
             if(res.meta.status!==200){
          return this.$message.error('删除参数失败')
      }else{
          this.$message.success('删除参数成功')
          this.getCateList()
          this.editDialogVisible=false
      }
    }
 },
 //监听关闭tag标签的事件
 handleClose(i,row){
    row.attr_vals.splice(i,1)
    this.saveAttrVals(row)
    
 },
//  文本框失去焦点或按下了enter键都会触发
 handleInputConfirm(row){
     if(row.inputValue.trim().length===0){
         row.inputValue=''
         row.inputVisible=false
         return
     }
    //  如果没有return则证明输入了内容,需要后续处理
    row.attr_vals.push(row.inputValue.trim())
    row.inputValue=''
    row.inputVisible=false
    this.saveAttrVals(row)
 },
//  将对attr_vals的操作保存到数据库
 async saveAttrVals(row){
// 需要发起请求,保存此处操作
    const {data:res}=await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,
    {
        attr_name:row.attr_name,
        attr_sel:row.attr_sel,
        attr_vals:row.attr_vals.join(' ')
    }
    )
    if(res.meta.status!==200){
        return this.$message.error('修改参数项失败!')
    }else{
        return this.$message.success('修改参数项成功!')
    }
 },
//  点击按钮展示文本输入框
 showInput(row){
  row.inputVisible=true
//   让文本框自动获得焦点
// $nextTick方法的作用就是当页面上元素被重新渲染之后才会执行回调函数中的代码
  this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus();
  });
 }
},
 computed:{
    //  如果按钮需要被禁用，则返回true,否则返回false
     isBtnDisabled(){
       if(this.selectedCateKeys.length!==3){
           return true
       }else{
           return false
       }
     },
    //  当前选中的三级分类的ID
     cateId(){
       if(this.selectedCateKeys.length===3){
           return this.selectedCateKeys[2]
       }else{
           return null
       }
     },
     //动态计算标题的文本
     titleText(){
       if(this.activeName==='many'){
           return '动态参数'
       }else{
           return '静态属性'
       }
     }
 }
}
</script>

<style lang='less' scoped>
.cat_opt{
    margin:15px 0
}
.el-tag{
    margin:10px
}
.input-new-tag{
    width: 120px;
}
</style>